-
DEPARTMENT OF ENERGY, LABOR, AND ECONOMIC GROWTH
DIRECTOR’S OFFICE
OCCUPATIONAL HEALTH STANDARDS
Filed with the Secretary of State on
These rules become effective immediately upon filing with the Secretary of State unless adopted under sections 33, 44, or 45a(6) of 1969 PA 306. Rules adopted under these sections become effective 7 days after filing with the Secretary of State.
(By authority conferred on the director of the department of energy, labor, and economic growth by sections 14 and 24 of 1974 PA 154, and Executive Reorganization Orders Nos. 1996-1, 1996-2, 2003-1,
and 2008-4, MCL 408.1014, 408.1024, 330.3101, 445.2001, 445.2011, and 445.2025)
Draft July 9, 2009
R 325.51101, R 325.51105, and R 325.51108 of the Michigan Administrative Code are amended and R 325.51101a is added to the Michigan Administrative Code as follows:
PART 301. AIR CONTAMINANTS FOR GENERAL INDUSTRY
R 325.51101 Scope; applicability; replacement of O.H. rules.
Rule 1. (1) These rules do not apply to the following types of employment:
(a) Agriculture.
(b) Construction.(c)(b) Domestic.(d)(c) Mining.(d) Construction.
Exposure to air contaminants in construction work is covered by occupational health standard part 601. air contaminants for construction, R 325.60151 to R 325.60161.
(2) These rules replace O.H. rules 2101, 2102, 2103, and 2104.
R 325.51101a Availability of referenced standards.
Rule 1a. The following Michigan occupational safety and health standards are referenced in these rules. Up to 5 copies of these standards may be obtained at no charge from the Michigan Department of Energy, Labor, and Economic Growth, MIOSHA Standards Section, 7150 Harris Drive, P.O. Box 30643, Lansing, Michigan, 48909-8143 or via the internet at website: www.michigan.gov/mioshastandards. For quantities greater than 5, the cost, as of the time of adoption of these rules, is 4 cents per page.
(a) Occupational health standard part 302. vinyl chloride, R 325.51401 to R 325.51414.
(b) Occupational health standard part 303. methylenedianiline, R 325.50051 to R 325.50076.
(c) Occupational health standard part 304. ethylene oxide, R 325.51151 to R 325.51177.
(d) Occupational health standard part 305. asbestos for general industry, R 325.51311 to R 325.51312.
(e) Occupational health standard part 306. formaldehyde, R 325.51451 to R 325.51477.
(f) Occupational health standard part 307. acrylonitrile, R 325.51501 to R 325.51527.
(g) Occupational health standard part 308. inorganic arsenic, R 325.51601 to R 325.51628.
(h) Occupational health standard part 309. cadmium, R 325.51851 to R 325.51886.
(i) Occupational health standard part 310. lead, R 325.51901 to R 325.51958.
(j) Occupational health standard part 311. benzene, R 325.77101 to R 325.77115.
(k) Occupational health standard part 312. 1,3-butadiene, R 325.50091 to R 325.50092.
(l) Occupational health standard part 313. methylene chloride, R 325.51651 to R 325.51652.
(m) Occupational health standard part 314. coke oven emissions, R 325.50101 to R 325.50136.
(n) Occupational health standard part 315. chromium (VI) in general industry, R 325.50141 to R 325.50143.
(o) Occupational health standard part 350. carcinogens, R 325.35001 to R 325.35011.
(p) Occupational health standard part 451. respiratory protection, R 325.60051 to R 325.60052.
(q) Occupational health standard part 601. air contaminants for construction, R 325.60151 to R 325.60161.
R 325.51105 Methods of compliance.
Rule 5. To achieve compliance with the provisions of R 325.51103 and R 325.51104, administrative or engineering controls shall first be determined and implemented when feasible. If such controls are not feasible to achieve full compliance, then personal protective equipment or any other protective measures shall be used to keep the employee’s exposure to air contaminants within the exposure limits prescribed in these rules. Any equipment and technical measures used for this purpose shall be approved for each particular use by a competent industrial hygienist or other technically qualified person. When a respirator is used, its use shall comply with the provisions of occupational health standard part 451.
R 325.60051 et seq. respiratory protection, R 325.60051 to R 325.60052Part 451.R 325.51108 Tables.
Rule 8. Tables G-1-A and G-2 read as follows:
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Abate
–
15
–
–
–
–
–
Acetaldehyde
75-07-0
100
180
150
270
–
–
–
Acetic acid
64-19-7
10
25
–
–
–
–
–
Acetic anhydride
108-24-7
–
–
–
–
5
20
–
Acetone
67-64-1
750
1800
1000
2400
–
–
–
Acetonitrile
75-05-8
40
70
60
105
–
–
–
2-Acetylaminofluorine;
see
O.H. rule 2301(1)OH Part 350, R 325.35001 to R 325.35011F53-96-3
Acetylene dichloride;
see 1,2-Dichloroethylene
Acetylene tetrabromide
79-27-6
1
14
–
–
–
–
–
Acetylsalicylic acid (Aspirin)
50-78-2
–
5
–
–
–
–
–
Acrolein
107-02-8
0.1
0.25
0.3
0.8
–
–
–
Acrylamide
79-06-1
–
0.03
–
–
–
–
x
Acrylic acid
79-10-7
10
30
–
–
–
–
x
Acrylonitrile; see OH Part 307,
R 325.51501 to R 325.51527F
et seq.F107-13-1
2
4.34
10
21.7
Aldrin
309-00-2
–
0.25
–
–
–
–
x
Allyl alcohol
107-18-6
2
5
4
10
–
–
x
Allyl chloride
107-05-1
1
3
2
6
–
–
–
Allyl glycidyl ether (AGE)
106-92-3
5
22
10
44
–
–
–
Allyl propyl disulfide
2179-59-1
2
12
3
18
–
–
–
α Alumina (aluminum oxide)
1344-28-1
–
5
–
–
–
–
–
Respirable fraction
Total dust
–
10
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Aluminum (as Al) Alkyls
Metal Respirable dust Total dust
Pyro powders Soluble salts Welding fumes*
7429-90-5
–
–
–
–
–
–
–
2
5
15
5
2
5
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
4-Aminodiphenyl; see
O.H. rule2301(2)OH Part 350,R 325.35001 to R 325.35011F
92-67-1
2-Aminoethanol; see Ethanolamine
2-Aminopyridine
504-29-0
0.5
2
–
–
–
–
–
Amitrole
61-82-5
–
0.2
–
–
–
–
–
Ammonia
7664-41-7
–
–
35
2724–
–
–
Ammonium chloride fume
12125-02-
9
–
10
–
20
–
–
–
Ammonium sulfamate
7773-06-0
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
n-Amyl acetate
628-63-7
100
525
–
–
–
–
–
sec-Amyl acetate
626-38-0
125
650
–
–
–
–
–
Aniline and homologues
62-53-3
2
8
–
–
–
–
x
Anisidine (o- and p-isomers)
29191-52-
4
–
0.5
–
–
–
–
x
Antimony and compounds (as Sb)
7440-36-0
–
0.5
–
–
–
–
–
ANTU (alpha- naphthylthiourea)
86-88-4
–
0.3
–
–
–
–
–
Arsenic, organic compounds (as As)
7440-38-2
–
0.5
–
–
–
–
–
Arsenic, inorganic compounds (as As); see OH Part 308,
R 325.51601 to R 325.51628F
et seq.F7440-38-2
0.01
Arsine
7784-42-1
0.05
0.2
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
TWA
STEL
Asbestos; see OH Part 305, R 325.51311 to R 325.51312F
etseq.FVaries
0.1f/cc
–
ppmB
mg/m3C
ppmB
mg/m3C
Atrazine
1912-24-9
–
5
–
–
–
–
–
Azinphos-methyl
86-50-0
–
0.2
–
–
–
–
x
Barium, soluble compounds (as Ba)
7440-39-3
–
0.5
–
–
–
–
–
Barium sulfate Respirable dust Total dust
7727-43-7
–
–
5
10
–
–
–
–
–
–
–
–
–
–
Benomyl Respirable dust Total dust
17804-35-
2
–
–
5
10
–
–
–
–
–
–
–
–
–
–
BenzeneE; see OH Part 311, R 325.77101 to R 325.77115F
etseq.Fandtable G-2 for limits applicable in the
operations or sectors excluded in
R 325.77101E
71-43-2
1
3.19
5
15.97
Benzidine; see
O.H. rule2301(3)OH Part 350,R 325.35001 to R 325.35011F
92-87-5
p-Benzoquinone; see Quinone
Benzo(a)pyrene; see Coal tar pitch volatiles
Benzoyl peroxide
94-36-0
–
5
–
–
–
–
–
Benzyl chloride
100-44-7
1
5
–
–
–
–
–
Beryllium and beryllium compounds (as Be)
7440-41-7
See table G-2
Biphenyl; see Diphenyl
Bismuth telluride, Undoped Respirable dust
Total dust
1304-82-1
–
–
5
15
–
–
–
–
–
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Bismuth telluride, Se-doped
–
5
–
–
–
–
–
Borates, Tetra, Sodium Salts Anhydrous
Decahydrate Pentahydrate
1330-43-4
1303-96-4
12179-04-
3
–
–
–
10
10
10
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
Boron oxide, Total dust
1303-86-2
–
10
–
–
–
–
–
Boron tribromide
10294-33-
4
–
–
–
–
1
10
–
Boron trifluoride
7637-07-2
–
–
–
–
1
3
–
Bromacil
314-40-9
1
10
–
–
–
–
–
Bromine
7726-95-6
0.1
0.7
0.3
2
–
–
–
Bromine pentafluoride
7789-30-2
0.1
0.7
–
–
–
–
–
Bromoform
75-25-2
0.5
5
–
–
–
–
–
1,3-Butadiene; see OH Part 312, R 325.50091 to
R 325.50092F
et seq.F106-99-0
1
2.2
5
11.1
–
–
–
Butane
106-97-8
800
1900
–
–
–
–
–
Butanethiol; see Butyl mercaptan
2-Butanone (Methyl ethyl ketone)
78-93-3
200
590
300
885
–
–
–
2-Butoxyethanol
111-76-2
25
120
–
–
–
–
x
n-Butyl acetate
123-86-4
150
710
200
950
–
–
–
sec-Butyl acetate
105-46-4
200
950
–
–
–
–
–
tert-Butyl acetate
540-88-5
200
950
–
–
–
–
–
Butyl acrylate
141-32-2
10
55
–
–
–
–
–
n–Butyl alcohol (n-butanol)
71-36-3
–
–
–
–
50
150
x
sec-Butyl alcohol (sec-butanol)
78-92-2
100
305
–
–
–
–
–
tert-Butyl alcohol (tert-butanol)
75-65-0
100
300
150
450
–
–
–
Butylamine
109-73-9
–
–
–
–
5
15
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
tert-Butyl chromate
(as CrO3)(as Cr+6); see OH Part 315, R 325.50141 to R 325.50143F,G
1189-85-1
–
0.005
(5
μg/m3)
–
–
–
0.1
x
n-Butyl glycidyl ether (BGE)
2426-08-6
25
135
–
–
–
–
–
n-Butyl lactate
138-22-7
5
25
–
–
–
–
–
Butyl mercaptan
109-79-5
0.5
1.5
–
–
–
–
–
o-sec-Butylphenol
89-72-5
5
30
–
–
–
–
x
p-tert-Butyltoluene
98-51-1
10
60
20
120
–
–
–
Cadmium; see OH Part 309, R 325.51851 to R 325.51886F
etseq.F7440-43-9
–
0.005
–
–
–
–
–
Calcium carbonate,
1317-65-3
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Calcium cyanamide
156-62-7
–
0.5
–
–
–
–
–
Calcium hydroxide
1305-62-0
–
5
–
–
–
–
–
Calcium oxide
1305-78-8
–
5
–
–
–
–
–
Calcium silicate,
1344-95-2
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Calcium sulfate,
7778-18-9
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Camphor, synthetic
76-22-2
–
2
–
–
–
–
–
Caprolactam,
105-60-2
– 5
1
20
– 10
3
40
–
–
–
–
–
–
Dust Vapor
Captafol (DifolatanR)
2425-06-1
–
0.1
–
–
–
–
–
Captan
133-06-2
–
5
–
–
–
–
–
Carbaryl (SevinR)
63-25-2
–
5
–
–
–
–
–
Carbofuran (FuradanR)
1563-66-2
–
0.1
–
–
–
–
–
Carbon black
1333-86-4
–
3.5
–
–
–
–
–
Carbon dioxide
124-38-9
10,000
18,000
30,000
54,000
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Carbon disulfide
75-15-0
4
12
12
36
–
–
x
Carbon monoxide
630-08-0
35
40
–
–
200
229
–
Carbon tetrabromide
558-13-4
0.1
1.4
0.3
4
–
–
–
Carbon tetrachloride (Tetrachloromethane)
56-23-5
2
12.6
–
–
–
–
x
Carbonyl fluoride
353-50-4
2
5
5
15
–
–
–
Catechol (Pyrocatechol)
120-80-9
5
20
–
–
–
–
x
Cellulose,
9004-34-6
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Cesium hydroxide
21351-79-
1
–
2
–
–
–
–
–
Chlordane
57-74-9
–
0.5
–
–
–
–
x
Chlorinated camphene (Toxaphone)
8001-35-2
–
0.5
–
1
–
–
x
Chlorinated diphenyl oxide
55720-99-
5 or
31242-93-
0
–
0.5
–
–
–
–
–
Chlorine
7782-50-5
0.5
1.5
1
3
–
–
–
Chlorine dioxide
10049-04-
4
0.1
0.3
0.3
0.9
–
–
–
Chlorine trifluoride
7790-91-2
–
–
–
–
0.1
0.4
–
Chloroacetaldehyde
107-20-0
–
–
–
–
1
3
–
2-Chloroacetophenone (Phenacyl chloride)
532-27-4
0.5
0.3
–
–
–
–
–
Chloroacetyl chloride
79-04-9
0.5
0.2
–
–
–
–
–
Chlorobenzene
108-90-7
75
350
–
–
–
–
–
o-Chlorobenzylidene malononitrile
2698-41-1
–
–
–
–
0.05
0.4
x
Chlorobromomethane
74-97-5
200
1050
–
–
–
–
–
2-Chloro-1,3-butadiene; see β- Chloroprene
Chlorodifluoromethane
75-45-6
1000
3500
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Chlorodiphenyl (42% Chlorine) (PCB)
53469-21-
9
–
1
–
–
–
–
x
Chlorodiphenyl (54% Chlorine) (PCB)
11097-69-
1
–
0.5
–
–
–
–
x
1-Chloro-2,3-epoxy propane; see Epichlorohydrin
2-Chloroethanol; see Ethylene chlorohydrin
Chloroethylene; see Vinyl chloride
Chloroform (Trichloromethane)
67-66-3
2
9.78
–
–
–
–
–
bis (Chloromethyl) ether;
see
O.H. Rule 2301(4)FOH Part 350, R 325.35001 toR 325.35011F
542-88-1
Chloromethyl methyl ether; see
O.H. rule 2301(8)OH Part 350, R 325.35001 to R 325.35011F107-30-2
1-Chloro-1-nitropropane
600-25-9
4
10
–
–
–
–
–
Chloropentafluoroethane
76-15-3
1000
6320
–
–
–
–
–
Chloropicrin
76-06-2
0.1
0.7
–
–
–
–
–
beta-Chloroprene
126-99-8
10
35
–
–
–
–
x
o-Chlorostyrene
2039-87-4
50
285
75
428
–
–
–
o-Chlorotoluene
95-49-8
50
250
–
–
–
–
–
2-Chloro-6-(trichloromethyl) pyridine,
Respirable dust Total dust
1929-82-4
–
–
5
15
–
–
–
–
–
–
–
–
–
–
Chlorpyrifos
2921-88-2
–
0.2
–
–
–
–
x
Chromic acid and chromates
(as CrO3)(as Cr+6); see OH Part 315, R 325.50141 to R 325.50143F, GVaries with compound
–
0.005
(5
μg/m3)
–
–
–
0.1
–
Chromium (II) compounds (as Cr)
7440-47-3
–
0.5
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Chromium (III) compounds (as Cr)
7440-47-3
–
0.5
–
–
–
–
–
Chromium (VI) compounds; see OH Part 315, R 325.50141 to R 325.50143F, G
Varies with compound
(5
μg/m3)
Chromium metal (as Cr)
7440-47-3
–
1
–
–
–
–
–
Chrysene; see Coal tar pitch volatile
Clopidol
2971-90-6
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Coal dust (less than 5% SiO2) Respirable
quartzdust–
–
2
–
–
–
–
–
Coal dust (greater than or equal to 5%
SiO2),
Respirable dust
–
–
0.1
–
–
–
–
–
Coal tar pitch volatile (as benzene solubles) anthracene, BaP, phenanthrene,
acridine, crysene, pyrene
65996-93-
2
–
0.2
–
–
–
–
–
Cobalt metal, dust, and fume (as Co)
7440-48-4
–
0.05
–
–
–
–
–
Cobalt carbonyl (as Co)
10210-68-
1
–
0.1
–
–
–
–
–
Cobalt hydrocarbonyl (as Co)
16842-03-
8
–
0.1
–
–
–
–
–
Coke oven emissions; see OH Part 314, R
325.50101 to R 325.50136F
etseq.F
–
–
0.15
(150
μg/m3)
–
–
–
–
–
Copper,
7440-50-8
–
1
–
–
–
–
–
Dusts and mists (as Cu)
Fume (as Cu)
–
0.1
–
–
–
–
–
Cotton dust (raw)
–
–
1
–
–
–
–
–
Crag herbicide (Sesone)
136-78-7
–
10
–
–
–
–
–
Total dust
Respirable fraction
–
5
–
–
–
–
–
Cresol, all isomers
1319-77-3
5
22
–
–
–
–
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Crotonaldehyde
123-73-9
4170-30-3
2
6
–
–
–
–
–
Crufomate
299-86-5
–
5
–
–
–
–
–
Cumene
98-82-8
50
245
–
–
–
–
x
Cyanamide
420-04-2
–
2
–
–
–
–
–
Cyanides (as CN)
Varies with compound
–
5
–
–
–
–
x
Cyanogen
460-19-5
10
20
–
–
–
–
–
Cyanogen chloride
506-77-4
–
–
–
–
0.3
0.6
–
Cyclohexane
110-82-7
300
1050
–
–
–
–
–
Cyclohexanol
108-93-0
50
200
–
–
–
–
x
Cyclohexanone
108-94-1
25
100
–
–
–
–
x
Cyclohexene
110-83-8
300
1015
–
–
–
–
–
Cyclohexylamine
108-91-8
10
40
–
–
–
–
–
Cyclonite
121-82-4
–
1.5
–
–
–
–
x
Cyclopentadiene
542-92-7
75
200
–
–
–
–
–
Cyclopentane
287-92-3
600
1720
–
–
–
–
–
Cyhexatin
13121-70-
5
–
5
–
–
–
–
–
2,4-D (Dichlorophenoxyacetic acid)
94-75-7
–
10
–
–
–
–
–
Decaborane
17702-41-
9
0.05
0.3
0.15
0.9
–
–
x
Demeton (SystoxR)
8065-48-3
–
0.1
–
–
–
–
x
Diacetone alcohol
(4-Hydroxy-4-methyl-2- pentanone)
123-42-2
50
240
–
–
–
–
–
1,2-Diaminoethane; see Ethylenediamine
Diazinon
333-41-5
–
0.1
–
–
–
–
x
Diazomethane
334-88-3
0.2
0.4
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Diborane
19287-45-
7
0.1
0.1
–
–
–
–
–
2-N-Dibutylaminoethanol
102-81-8
2
14
–
–
–
–
–
Dibutyl phosphate
107-66-4
1
5
2
10
–
–
–
Dibutyl phthalate
84-74-2
–
5
–
–
–
–
–
Dichloroacetylene
7572-29-4
–
–
–
–
0.1
0.4
–
o-Dichlorobenzene
95-50-1
–
–
–
–
50
300
–
p-Dichlorobenzene
106-46-7
75
450
110
675
–
–
–
3,3'-Dichlorobenzidine;
see
O.H. rule 2301(5)FOH Part 350, R 325.35001 toR 325.35011F
91-94-1
Dichlorodifluoromethane
75-71-8
1000
4950
–
–
–
–
–
1,3-Dichloro-5,5-dimethyl hydantoin
118-52-5
–
0.2
–
0.4
–
–
–
Dichlorodiphenyltri- chloroethane (DDT)
50-29-3
–
1
–
–
–
–
x
1,1-Dichloroethane
75-34-3
100
400
–
–
–
–
–
1,2-Dichloroethylene
540-59-0
200
790
–
–
–
–
–
Dichloroethyl ether
111-44-4
5
30
10
60
–
–
x
Dichlorofluoromethane
75-43-4
10
40
–
–
–
–
–
Dichloromethane; see Methylene chloride
1,1-Dichloro-1-nitroethane
594-72-9
2
10
–
–
–
–
–
1,2-Dichloropropane;
see Propylene dichloride
1,3-Dichloropropene
542-75-6
1
5
–
–
–
–
x
2,2-Dichloropropionic acid
75-99-0
1
6
–
–
–
–
–
Dichlorotetrafluoroethane
76-14-2
1000
7000
–
–
–
–
–
Dichlorvos (DDVP)
62-73-7
–
1
–
–
–
–
x
Dicrotophos
141-66-2
–
0.25
–
–
–
–
x
Dicyclopentadiene
77-73-6
5
30
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Dicyclopentadienyl iron,
102-54-5
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Dieldrin
60-57-1
–
0.25
–
–
–
–
x
Diethanolamine
111-42-2
3
15
–
–
–
–
–
Diethylamine
109-89-7
10
30
25
75
–
–
–
2-Diethylaminoethanol
100-37-8
10
50
–
–
–
–
x
Diethylene triamine
111-40-0
1
4
–
–
–
–
x
Diethyl ether; see Ethyl ether
Diethyl ketone
96-22-0
200
705
–
–
–
–
–
Diethyl phthalate
84-66-2
–
5
–
–
–
–
–
Difluorodibromomethane
75-61-6
100
860
–
–
–
–
–
Diglycidyl ether (DGE)
2238-07-5
0.1
0.5
–
–
–
–
–
Dihydroxybenzene; see Hydroquinone
Diisobutyl ketone
108-83-8
25
150
–
–
–
–
–
Diisopropylamine
108-18-9
5
20
–
–
–
–
x
4-Dimethylaminoazobenzene; see
O.H. rule 2301(6)FOH Part 350, R 325.35001 toR 325.35011F
60-11-7
Dimethoxymethane; see Methylal
Dimethyl acetamide
127-19-5
10
35
–
–
–
–
x
Dimethylamine
124-40-3
10
18
–
–
–
–
–
Dimethylaminobenzene; see Xylidine
Dimethylaniline (N,N- Dimethylaniline)
121-69-7
5
25
10
50
–
–
x
Dimethylbenzene; see Xylene
Dimethyl-1,2-dibromo-2,2- dichloroethyl phosphate
300-76-5
–
3
–
–
–
–
x
Dimethylformamide
68-12-2
10
30
–
–
–
–
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
2,6-Dimethyl-4-heptanone; see Diisobutyl ketone
1,1-Dimethylhydrazine
57-14-7
0.5
1
–
–
–
–
x
Dimethylphthalate
131-11-3
–
5
–
–
–
–
–
Dimethyl sulfate
77-78-1
0.1
0.5
–
–
–
–
x
Dinitolmide (3,5-Dinitro-o- toluamide)
148-01-6
–
5
–
–
–
–
–
Dinitrobenzene (all isomers) (meta-)
(ortho) (para-)
99-65-0
528-29-0
100-25-4
–
1
–
–
–
–
x
Dinitro-o-cresol
534-52-1
–
0.2
–
–
–
–
x
Dinitrotoluene
25321-14-
6
–
1.5
–
–
–
–
x
Dioxane (Diethylene dioxide)
123-91-1
25
90
–
–
–
–
x
Dioxathion (Delnav)
78-34-2
–
0.2
–
–
–
–
x
Diphenyl (Biphenyl)
92-52-4
0.2
1
–
–
–
–
–
Diphenylamine
122-39-4
–
10
–
–
–
–
–
Diphenylmethane diisocyanate; see
Methylene bisphenyl isocyanate
Dipropylene glycol methyl ether
34590-94-
8
100
600
150
900
–
–
x
Dipropyl ketone
123-19-3
50
235
–
–
–
–
–
Diquat
2768-72-9
–
0.5
–
–
–
–
–
Di-sec-octyl phthalate
[Di(2-ethylhexyl)phthalate]
117-81-7
–
5
–
10
–
–
–
Disulfiram
97-77-8
–
2
–
–
–
–
–
Disulfoton
298-04-4
–
0.1
–
–
–
–
x
2,6-Di-tert-butyl-p-cresol (Butylated hydroxytoluene)
128-37-0
–
10
–
–
–
–
–
Diuron
330-54-1
–
10
–
–
–
–
–
Divinyl benzene
1321-74-0
10
50
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Emery, Respirable dust
1302-74-5
–
5
–
–
–
–
–
Total dust
–
10
–
–
–
–
–
Endosulfan
115-29-7
–
0.1
–
–
–
–
x
Endrin
72-20-8
–
0.1
–
–
–
–
x
Epichlorohydrin
106-89-8
2
8
–
–
–
–
x
EPN
2104-64-5
–
0.5
–
–
–
–
x
1,2-Epoxypropane; see Propylene oxide
2,3-Epoxy-1-propanol; see Glycidol
Ethanethiol; see Ethyl mercaptan
Ethanolamine
141-43-5
3
8
6
15
–
–
–
Ethion
563-12-2
–
0.4
–
–
–
–
x
2-Ethoxyethanol (EGEE)
110-80-5
200
740
–
–
–
–
x
2-Ethoxyethyl acetate (Cellosolve acetate)
111-15-9
100
540
–
–
–
–
x
Ethyl acetate
141-78-6
400
1400
–
–
–
–
–
Ethyl acrylate
140-88-5
5
20
25
100
–
–
x
Ethyl alcohol (Ethanol)
64-17-5
1000
1900
–
–
–
–
–
Ethylamine
75-04-7
10
18
–
–
–
–
–
Ethyl amyl ketone (5-Methyl-3- heptanone)
541-85-5
25
130
–
–
–
–
–
Ethyl benzene
100-41-4
100
435
125
545
–
–
–
Ethyl bromide
74-96-4
200
890
250
1100
–
–
–
Ethyl butyl ketone (3- Heptanone)
106-35-4
50
230
–
–
–
–
–
Ethyl chloride
75-00-3
1000
2600
–
–
–
–
–
Ethyl ether
60-29-7
400
1200
500
500
1500
1500
–
–
–
Ethyl formate
109-94-4
100
300
–
–
–
–
–
Ethyl mercaptan
75-08-1
0.5
1
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Ethyl silicate
78-10-4
10
85
–
–
–
–
–
Ethylene chlorohydrin
107-07-3
–
–
–
–
1
3
x
Ethylenediamine
107-15-3
10
25
–
–
–
–
–
Ethylene dibromide
106-93-4
See table G-2
Ethylene dichloride
107-06-2
1
4
2
8
–
–
–
Ethylene glycol
107-21-1
–
–
–
–
50
125
–
Ethylene glycol dinitrate (EGDN)
628-96-6
–
–
–
0.1
–
–
x
Ethylene glycol methyl acetate (EGME);
see Methyl cellosolve acetate
Ethyleneimine; see
O.H. rule2301(7)OH Part 350,R 325.35001 to R 325.35011F
151-56-4
Ethylene oxide; see OH Part 304, R 325.51151 to
R 325.51177F
et seq.F75-21-8
1
1.8
5
9.0
-
-
-
Ethylidene chloride; see 1,1- Dichloroethane
Ethylidene norbornene
16219-75-
3
–
–
–
–
5
25
–
N-Ethylmorpholine
100-74-3
5
23
–
–
–
–
x
Fenamiphos
22224-92-
6
–
0.1
–
–
–
–
x
Fensulfothion (Dasanit)
115-90-2
–
0.1
–
–
–
–
–
Fenthion
55-38-9
–
0.2
–
–
–
–
x
Ferbam, Dust
14484-64-
1
–
10
–
–
–
–
–
Ferrovanadium dust
12604-58-
9
–
1
–
3
–
–
–
Fluorides (as F)
Varies with compound
–
2.5
–
–
–
–
–
Fluorine
7782-41-4
0.1
0.2
–
–
–
–
–
Fluorotrichloromethane (Trichlorofluoromethane)
75-69-4
–
–
–
–
1000
5600
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Fonofos
944-22-9
–
0.1
–
–
–
–
x
Formaldehyde; see OH Part 306, R 325.51451 to
R 325.51477F
et seq.F50-00-0
0.75
0.9
2
2.5
Formamide
75-12-7
20
30
30
45
–
–
–
Formic acid
64-18-6
5
9
–
–
–
–
–
Furfural
98-01-1
2
8
–
–
–
–
x
Furfuryl alcohol
98-00-0
10
40
15
60
–
–
x
Gasoline
8006-61-9
300
900
500
1500
–
–
–
Germanium tetrahydride
7782-65-2
0.2
0.6
–
–
–
–
–
Glutaraldehyde
111-30-8
–
–
–
–
0.2
0.8
–
Glycerin,
56-81-5
–
5
–
–
–
–
–
Respirable mist
Total mist
–
10
–
–
–
–
–
Glycidol
556-52-5
25
75
–
–
–
–
–
Glycol monoethyl ether; see 2- Ethoxyethanol
Grain dust (Oat, wheat, barley)
–
–
10
–
–
–
–
–
Graphite, natural Respirable dust
7782-42-5
–
2.5
–
–
–
–
–
Graphite, synthetic,
–
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
GuthionR; see Azinphos methyl
Gypsum, Respirable dust Total dust
13397-24-
5
–
–
5
15
–
–
–
–
–
–
–
–
–
–
Hafnium
7440-58-6
–
0.5
–
–
–
–
–
Heptachlor
76-44-8
–
0.5
–
–
–
–
x
Heptane (n-Heptane)
142-82-5
400
1600
500
2000
–
–
–
Hexachlorobutadiene
87-68-3
–
0.02
0.24
–
–
–
–
Hexachlorocyclopentadiene
77-47-4
0.01
0.1
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Hexachloroethane
67-72-1
1
10
–
–
–
–
x
Hexachloronaphthalene
1335-87-1
–
0.2
–
–
–
–
x
Hexafluoroacetone
684-16-2
0.1
0.7
–
–
–
–
x
Hexamethylene diisocyanate (HDI)
822-06-0
0.005
35
μg/m3
–
–
0.020
0.140
–
n-Hexane
110-54-3
50
180
–
–
–
–
–
Hexane isomers
Varies with compound
500
1800
1000
3600
–
–
–
2-Hexanone (Methyl n-butyl ketone)
591-78-6
5
20
–
–
–
–
–
Hexone (Methyl isobutyl ketone)
108-10-1
50
205
75
300
–
–
–
sec-Hexyl acetate
108-84-9
50
300
–
–
–
–
–
Hexylene glycol
107-41-5
–
–
–
–
25
125
–
Hydrazine
302-01-2
0.1
0.1
–
–
–
–
x
Hydrogenated terphenyls
61788-32-
7
0.5
5
–
–
–
–
–
Hydrogen bromide
10035-10-
6
–
–
–
–
3
10
–
Hydrogen chloride
7647-01-0
–
–
–
–
5
7
–
Hydrogen cyanide
74-90-8
–
–
4.7
5
–
–
x
Hydrogen fluoride (as F)
7664-39-3
3
–
6
–
–
–
–
Hydrogen peroxide
7722-84-1
1
1.4
–
–
–
–
–
Hydrogen selenide (as Se)
7783-07-5
0.05
0.2
–
–
–
–
–
Hydrogen sulfide
7783-06-4
10
14
15
21
–
–
–
Hydroquinone
123-31-9
–
2
–
–
–
–
–
2-Hydroxypropyl acrylate
999-61-1
0.5
3
–
–
–
–
x
Indene
95-13-6
10
45
–
–
–
–
–
Indium and compounds (as In)
7440-74-6
–
0.1
–
–
–
–
–
Iodine
7553-56-2
–
–
–
–
0.1
1
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Iodoform
75-47-8
0.6
10
–
–
–
–
–
Iron oxide fume
1309-37-1
–
10
–
–
–
–
–
Iron pentacarbonyl (as Fe)
13463-40-
6
0.1
0.8
0.2
1.6
–
–
–
Iron salts (soluble) (as Fe)
Varies with compound
–
1
–
–
–
–
–
Isoamyl acetate
123-92-2
100
525
–
–
–
–
–
Isoamyl alcohol (primary and secondary)
123-51-3
100
360
125
450
–
–
–
Isobutyl acetate
110-19-0
150
700
–
–
–
–
–
Isobutyl alcohol
78-83-1
50
150
–
–
–
–
–
Isooctyl alcohol
26952-21-
6
50
270
–
–
–
–
x
Isophorone
78-59-1
4
23
–
–
–
–
–
Isophorone diisocyanate (IPDI)
4098-71-9
0.005
–
0.02
–
–
–
x
2-Isopropoxyethanol
109-59-1
25
105
–
–
–
–
–
Isopropyl acetate
108-21-4
250
950
310
1185
–
–
–
Isopropyl alcohol
67-63-0
400
980
500
1225
–
–
–
Isopropylamine
75-31-0
5
12
10
24
–
–
–
N-Isopropylaniline
768-52-5
2
10
–
–
–
–
x
Isopropyl ether
108-20-3
500
2100
–
–
–
–
–
Isopropyl glycidyl ether (IGE)
4016-14-2
50
240
75
360
–
–
–
Kaolin,
–
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Ketene
463-51-4
0.5
0.9
1.5
3
–
–
–
Lead inorganic (as Pb); see OH Part 310, R
325.51901 to R 325.51958F
etseq.F
7439-92-1
–
0.05
(50
μg/m3)
–
–
–
–
–
Limestone, (calcium carbonate)
1317-65-3
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Lindane
58-89-9
–
0.5
–
–
–
–
x
Lithium hydride
7580-67-8
–
0.025
–
–
–
–
–
L.P.G. (Liquified petroleum gas)
68476-85-
7
1000
1800
–
–
–
–
–
Magnesite,
546-93-0
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Magnesium oxide fume, Total particulate
1309-48-4
–
10
–
–
–
–
–
Malathion dust
121-75-5
–
10
–
–
–
–
x
Maleic anhydride
108-31-6
1
–
–
–
–
–
–
Manganese,
7439-96-5
–
–
– 1
–
–
– 3
–
–
5
–
–
–
Compounds (as Mn) Fume (as Mn)
Manganese cyclopentadienyl tricarbonyl
(as Mn)
12079-65-
1
–
0.1
–
–
–
–
x
Manganese tetroxide (as Mn)
1317-35-7
–
1
–
–
–
–
–
Marble (calcium carbonate),
1317-65-3
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Mercury
7439-97-6
–
–
–
– 0.01
0.05
–
–
–
– 0.03
–
–
–
–
0.1
–
–
x x x
Inorganic and aryl compounds (As Hg)
Organic compounds (as Hg) Vapor (as Hg)
Mesityl oxide
141-79-7
15
60
25
100
–
–
–
Methacrylic acid
79-41-4
20
70
–
–
–
–
x
Methanethiol; see Methyl mercaptan
Methomyl (Lannate)
16752-77-
5
–
2.5
–
–
–
–
–
Methoxychlor dust
72-43-5
–
10
–
–
–
–
–
2-Methoxyethanol; see Methyl cellosolve
4-Methoxyphenol
150-76-5
–
5
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Methyl acetate
79-20-9
200
610
250
760
–
–
–
Methyl acetylene (Propyne)
74-99-7
1000
1650
–
–
–
–
–
Methyl acetylene-propadiene mixture
(MAPP)
–
1000
1800
1250
2250
–
–
–
Methyl acrylate
96-33-3
10
35
–
–
–
–
x
Methylacrylonitrile
126-98-7
1
3
–
–
–
–
x
Methylal (Dimethoxymethane)
109-87-5
1000
3100
–
–
–
–
–
Methyl alcohol
67-56-1
200
260
250
325
–
–
x
Methylamine
74-89-5
10
12
–
–
–
–
–
Methyl amyl alcohol;
see Methyl isobutyl carbinol
Methyl n-amyl ketone
110-43-0
100
465
–
–
–
–
–
Methyl bromide
74-83-9
5
20
–
–
–
–
x
Methyl n-butyl ketone; see 2- Hexanone
Methyl cellosolve (2- Methoxyethanol)
109-86-4
25
80
–
–
–
–
x
Methyl cellosolve acetate (2-Methoxyethyl acetate)
110-49-6
25
120
–
–
–
–
x
Methyl chloride
74-87-3
50
105
100
210
–
–
–
Methyl chloroform (1,1,1- Trichloroethane)
71-55-6
350
1900
450
2450
–
–
–
Methyl 2-cyanoacrylate
137-05-3
2
8
4
16
–
–
–
Methylcyclohexane
108-87-2
400
1600
–
–
–
–
–
Methylcyclohexanol
25639-42-
3
50
235
–
–
–
–
–
o-Methylcyclohexanone
583-60-8
50
230
75
345
–
–
x
Methylcyclopentadienyl manganese tricarbonyl (as Mn)
12108-13-
3
–
0.2
–
–
–
–
x
Methyl demeton
8022-00-2
–
0.5
–
–
–
–
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
4,4'-Methylene bis(2- chloroaniline)
(MBOCA)
101-14-4
0.02
0.22
–
–
–
–
x
Methylene bis(4- cyclohexylisocyanate) (MCBI)
5124-30-1
0.005
–
–
–
0.01
0.11
–
Methylene bisphenyl isocyanate (MDI)
101-68-8
0.005
0.05
–
–
0.02
0.2
–
Methylene chloride, see OH Part 313, R 325.51651 to
R 325.51652F
et seq.F75-09-2
25
87
125
434
Methylenedianiline (MDA); see OH Part 303, R 325.50051 to R 325.50076F
etseq.F101-77-9
10
ppb**
0.08
mg/m3
100
ppb**
0.8
mg/m3
–
–
–
Methyl ethyl ketone (MEK); see 2-Butanone
Methyl ethyl ketone peroxide (MEKP)
1338-23-4
–
–
–
–
0.7
5
–
Methyl formate
107-31-3
100
250
150
375
–
–
–
Methyl hydrazine
60-34-4
–
–
–
–
0.2
0.35
x
Methyl iodide
74-88-4
2
10
–
–
–
–
x
Methyl isoamyl ketone
110-12-3
50
240
–
–
–
–
–
Methyl isobutyl carbinol
108-11-2
25
100
40
165
–
–
x
Methyl isobutyl ketone; see Hexone
Methyl isocyanate (MIC)
624-83-9
0.02
0.05
–
–
–
–
x
Methyl isopropyl ketone
563-80-4
200
705
–
–
–
–
–
Methyl mercaptan
74-93-1
0.5
1
–
–
–
–
–
Methyl methacrylate
80-62-6
100
410
–
–
–
–
Methyl parathion
298-00-0
–
0.2
–
–
–
–
x
Methyl propyl ketone; see 2- Pentanone
Methyl silicate
681-84-5
1
6
–
–
5
30
–
alpha-Methyl styrene
98-83-9
50
240
100
485
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Metribuzin
21087-64-
9
–
5
–
–
–
–
–
Mica; see Silicates
Molybdenum, (as Mo)
7439-98-7
–
10
–
–
–
–
–
Insoluble compounds
Soluble compounds
–
5
–
–
–
–
–
Monocrotophos (AzodrinR)
6923-22-4
–
0.25
–
–
–
–
–
Monomethyl aniline
100-61-8
0.5
2
–
–
–
–
x
Morpholine
110-91-8
20
70
30
105
–
–
x
Naphtha (Coal tar)
8030-30-6
100
400
–
–
–
–
–
Naphthalene
91-20-3
10
50
15
75
–
–
–
Naphthalene diisocyanate (NDI)
3173-72-6
0.005
0.040
–
–
0.020
0.170
–
alpha-Naphthylamine;
see
O.H. rule 2301(10)FOH Part 350, R 325.35001 toR 325.35011F
134-32-7
beta-Naphthylamine;
see
O.H. rule 2301(11)FOH Part 350, R 325.35001 toR 325.35011F
91-59-8
Nickel carbonyl (as Ni)
13463-39-
3
0.001
0.007
–
–
–
–
–
Nickel,
7440-02-0
–
–
1
0.1
–
–
–
–
–
–
–
–
–
–
Metal and insoluble compounds (as Ni)
Soluble compounds (as Ni)
Nicotine
54-11-5
–
0.5
–
–
–
–
x
Nitric acid
7697-37-2
2
5
4
10
–
–
–
Nitric oxide
10102-43-
9
25
30
–
–
–
–
–
p-Nitroaniline
100-01-6
–
3
–
–
–
–
x
Nitrobenzene
98-95-3
1
5
–
–
–
–
x
p-Nitrochlorobenzene
100-00-5
–
1
–
–
–
–
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
4-Nitrodiphenyl; see
O.H. rule2301(12)FOH Part 350,R 325.35001 to R 325.35011F
92-93-3
Nitroethane
79-24-3
100
310
–
–
–
–
–
Nitrogen dioxide
10102-44-
0
–
–
1
1.8
–
–
–
Nitrogen trifluoride
7783-54-2
10
29
–
–
–
–
–
Nitroglycerin
55-63-0
–
–
–
0.1
–
–
x
Nitromethane
75-52-5
100
250
–
–
–
–
–
1-Nitropropane
108-03-2
25
90
–
–
–
–
–
2-Nitropropane
79-46-9
10
35
–
–
–
–
–
N-Nitrosodimethylamine;
see
O.H. rule 2301(13)FOH Part 350, R 325.35001 toR 325.35011F
62-75-9
Nitrotoluene o-isomer m-isomer p-isomer
88-72-2
99-08-1
99-99-0
2
11
–
–
–
–
x
Nitrotrichloromethane; see Chloropicrin
Nonane
111-84-2
200
1050
–
–
–
–
–
Octachloronaphthalene
2234-13-1
–
0.1
–
0.3
–
–
x
Octane
111-65-9
300
1450
375
1800
–
–
–
Oil mist, mineral
8012-95-1
–
5
–
–
–
–
–
Osmium tetroxide (as Os)
20816-12-
0
–
0.002
–
0.006
–
–
–
Oxalic acid
144-62-7
–
1
–
2
–
–
–
Oxygen difluoride
7783-41-7
–
–
–
–
0.05
0.1
–
Ozone
10028-15-
6
0.1
0.2
0.3
0.6
–
–
–
Paraffin wax fume
8002-74-2
–
2
–
–
–
–
–
Paraquat, respirable dust
1910-42-5
2074-50-2
4685-14-7
–
0.1
–
–
–
–
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Parathion
56-38-2
–
0.1
–
–
–
–
x
Particulates not otherwise regulated,
Respirable dust Total dust
–
–
–
–
–
5
15
–
–
–
–
–
–
–
–
–
–
Pentaborane
19624-22-
7
0.005
0.01
0.015
0.03
–
–
–
Pentachloronaphthalene
1321-64-8
–
0.5
–
–
–
–
x
Pentachlorophenol
87-86-5
–
0.5
–
–
–
–
x
Pentaerythritol,
115-77-5
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Pentane
109-66-0
600
1800
750
2250
–
–
–
2-Pentanone (Methyl propyl ketone)
107-87-9
200
700
250
875
–
–
–
Perchloroethylene (Tetrachloroethylene)
127-18-4
25
170
–
–
–
–
–
Perchloromethyl mercaptan
594-42-3
0.1
0.8
–
–
–
–
–
Perchloryl fluoride
7616-94-6
3
14
6
28
–
–
–
Perlite Respirable dust Total dust
93763-70-
3
–
–
5
15
–
–
–
–
–
–
–
–
–
–
Petroleum distillates (Naphtha) (Rubber solvent)
400
1600
–
–
–
–
–
Phenol
108-95-2
5
19
–
–
–
–
x
Phenothiazine
92-84-2
–
5
–
–
–
–
x
p-Phenylenediamine
106-50-3
–
0.1
–
–
–
–
x
Phenyl ether, vapor
101-84-8
1
7
–
–
–
–
–
Phenyl ether-biphenyl mixture, vapor
–
1
7
–
–
–
–
–
Phenylethylene; see Styrene
Phenyl glycidyl ether (PGE)
122-60-1
1
6
–
–
–
–
–
Phenylhydrazine
100-63-0
5
20
10
45
–
–
x
Phenyl mercaptan
108-98-5
0.5
2
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Phenylphosphine
638-21-1
–
–
–
–
0.05
0.25
–
Phorate
298-02-2
–
0.05
–
0.2
–
–
x
Phosdrin (MevinphosR)
7786-34-7
–
0.1
–
0.3
–
–
x
Phosgene (Carbonyl chloride)
75-44-5
0.1
0.4
–
–
–
–
–
Phosphine
7803-51-2
0.3
0.4
1
1
–
–
–
Phosphoric acid
7664-38-2
–
1
–
3
–
–
–
Phosphorus (yellow)
7723-14-0
–
0.1
–
–
–
–
–
Phosphorus oxychloride
10025-87-
3
0.1
0.6
–
–
–
–
–
Phosphorus pentachloride
10026-13-
8
–
1
–
–
–
–
–
Phosphorus pentasulfide
1314-80-3
–
1
–
3
–
–
–
Phosphorus trichloride
7719-12-2
0.2
1.5
0.5
3
–
–
–
Phthalic anhydride
85-44-9
1
6
–
–
–
–
–
m-Phthalodinitrile
626-17-5
–
5
–
–
–
–
–
Picloram,
1918-02-1
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Picric acid
88-89-1
–
0.1
–
–
–
–
x
Piperazine dihydrochloride
142-64-3
–
5
–
–
–
–
–
Pindone (2-Pivalyl-1,3- indandione)
83-26-1
–
0.1
–
–
–
–
–
Plaster of Paris (Calcium
26499-65-
0
–
–
5
15
–
–
–
–
–
–
–
–
–
–
sulfate), Respirable dust Total dust
Platinum (as Pt)
7440-06-4
–
1
–
–
–
–
–
Metal
Soluble salts
–
0.002
–
–
–
–
–
Portland cement, Respirable dust Total dust
65997-15-
1
–
–
5
10
–
–
–
–
–
–
–
–
–
–
Potassium hydroxide
1310-58-3
–
–
–
–
–
2
–
Propane
74-98-6
1000
1800
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Propargyl alcohol
107-19-7
1
2
–
–
–
–
x
beta-Propriolactone; see
O.H.rule2301(14)FOH Part 350, R 325.35001 to R 325.35011F57-57-8
Propionic acid
79-09-4
10
30
–
–
–
–
–
Propoxur (Baygon)
114-26-1
–
0.5
–
–
–
–
–
n-Propyl acetate
109-60-4
200
840
250
1050
–
–
–
n-Propyl alcohol
71-23-8
200
500
250
625
–
–
–
n-Propyl nitrate
627-13-4
25
105
40
170
–
–
–
Propylene dichloride
78-87-5
75
350
110
510
–
–
–
Propylene glycol dinitrate
6423-43-4
0.05
0.3
–
–
–
–
–
Propylene glycol monomethyl ether
107-98-2
100
360
150
540
–
–
–
Propylene imine
75-55-8
2
5
–
–
–
–
x
Propylene oxide
75-56-9
20
50
–
–
–
–
–
Propyne; see Methyl acetylene
Pyrethrum
8003-34-7
–
5
–
–
–
–
–
Pyridine
110-86-1
5
15
–
–
–
–
–
Quinone
106-51-4
0.1
0.4
–
–
–
–
–
Resorcinol
108-46-3
10
45
20
90
–
–
–
Rhodium,
7440-16-6
–
–
0.1
0.1
–
–
–
–
–
–
–
–
–
–
Insoluble compounds (as Rh) Metal fume (as Rh)
Soluble compounds (as Rh)
–
0.001
–
–
–
–
–
Ronnel
299-84-3
–
10
–
–
–
–
–
Rosin core solder pyrolysis products,
as formaldehyde
–
–
0.1
–
–
–
–
–
Rotenone
83-79-4
–
5
–
–
–
–
–
Rouge,
–
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Selenium compounds (as Se)
7782-49-2
–
0.2
–
–
–
–
–
Selenium hexafluoride (as Se)
7783-79-1
0.05
0.4
–
–
–
–
–
Silica, amorphous, precipitated and gel
112926-
00-8
–
6
–
–
–
–
–
Silica, amorphous, diatomaceous earth, containing less than 1% crystalline silica
61790-53-
2
–
6
–
–
–
–
–
Silica, crystalline cristobalite, Respirable dust
14464-46-
1
–
0.05
–
–
–
–
–
Silica, crystalline quartz, Respirable dust
14808-60-
7
–
0.1
–
–
–
–
–
Silica, crystalline tridymite, Respirable dust
15468-32-
3
–
0.05
–
–
–
–
–
Silica, crystalline tripoli, Respirable dust
1317-95-9
–
0.1
–
–
–
–
–
Silica, fused, Respirable dust
60676-86-
0
–
0.1
–
–
–
–
–
Silicates (less than 1% crystalline silica)
Mica, respirable dust
12001-26-
2
–
3
–
–
–
–
–
Soapstone, respirable dust
–
–
3
–
–
–
–
–
Soapstone, total dust
–
–
6
–
–
–
–
–
Talc (containing asbestos); use asbestos limit
–
OH Part 305 Asbestos for General Industry, R 325.51311 to R 325.51312 et seq., Asbestos for General Industry
Talc (containing no asbestos), respirable dust
14807-96-
6
–
2
–
–
–
–
–
Tremolite
–
OH Part 305 Asbestos for General Industry, R 325.51311 to R 325.51312 et seq., Asbestos for General Industry
Silicon, Respirable dust Total dust
7440-21-3
–
–
5
10
–
–
–
–
–
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Silicon carbide,
409-21-2
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Silicon tetrahydride
7803-62-5
5
7
–
–
–
–
–
Silver, metal and soluble compounds (as
Ag)
7440-22-4
–
0.01
–
–
–
–
–
Soapstone; see Silicates
Sodium azide (as HN3)
(as NaN3)
26628-22-
8
–
–
–
–
–
–
–
–
0.1
–
–
0.3
x x
Sodium bisulfite
7631-90-5
–
5
–
–
–
–
–
Sodium fluoroacetate
62-74-8
–
0.05
–
0.15
–
–
x
Sodium hydroxide
1310-73-2
–
–
–
–
–
2
–
Sodium metabisulfite
7681-57-4
–
5
–
–
–
–
–
Starch,
9005-25-8
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Stibine
7803-52-3
0.1
0.5
–
–
–
–
–
Stoddard solvent
8052-41-3
100
525
–
–
–
–
–
Strychnine
57-24-9
–
0.15
–
–
–
–
–
Styrene
100-42-5
50
215
100
425
–
–
–
Subtilisins (Proteolytic enzymes)
9014-01-1
–
–
–
0.00006
(60
min.)
–
–
–
Sucrose,
57-50-1
–
5
–
–
–
–
–
Respirable dust
Total dust
–
15
–
–
–
–
–
Sulfur dioxide
7446-09-5
2
5
5
10
–
–
–
Sulfur hexafluoride
2551-62-4
1000
6000
–
–
–
–
–
Sulfuric acid
7664-93-9
–
1
–
–
–
–
–
Sulfur monochloride
10025-67-
9
–
–
–
–
1
6
–
Sulfur pentafluoride
5714-22-7
–
–
–
–
0.01
0.1
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Sulfur tetrafluoride
7783-60-0
–
–
–
–
0.1
0.4
–
Sulfuryl fluoride
2699-79-8
5
20
10
40
–
–
–
Sulprofos
35400-43-
2
–
1
–
–
–
–
–
SystoxR; see Demeton
2,4,5-T (2,4,5-
trichlorophenoxyacetic acid)
93-76-5
–
10
–
–
–
–
–
Talc; see Silicates
Tantalum, metal and oxide dust
7440-25-7
–
5
–
–
–
–
–
TEDP (Sulfotep)
3689-24-5
–
0.2
–
–
–
–
x
Tellurium and compounds (as Te)
13494-80-
9
–
0.1
–
–
–
–
–
Tellurium hexafluoride (as Te)
7783-80-4
0.02
0.2
–
–
–
–
–
Temephos,
3383-96-8
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
TEPP
107-49-3
–
0.05
–
–
–
–
x
Terphenyls
26140-60-
3
–
–
–
–
0.5
5
–
1,1,1,2-Tetrachloro-2, 2- difluoroethane
76-11-9
500
4170
–
–
–
–
–
1,1,2,2-Tetrachloro-1, 2- difluoroethane
76-12-0
500
4170
–
–
–
–
–
1,1,2,2-Tetrachloroethane
79-34-5
1
7
–
–
–
–
x
Tetrachloroethylene; see Perchloroethylene
Tetrachloromethane;
see Carbon tetrachloride
Tetrachloronaphthalene
1335-88-2
–
2
–
–
–
–
x
Tetraethyl lead (as Pb)
78-00-2
–
0.075
–
–
–
–
x
Tetrahydrofuran
109-99-9
200
590
250
735
–
–
–
Tetramethyl lead (as Pb)
75-74-1
–
0.075
–
–
–
–
x
Tetramethyl succinonitrile
3333-52-6
0.5
3
–
–
–
–
x
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Tetranitromethane
509-14-8
1
8
–
–
–
–
–
Tetrasodium pyrophosphate
7722-88-5
–
5
–
–
–
–
–
Tetryl (2,4,6- Trinitrophenylmethylnitramine)
479-45-8
–
1.5
–
–
–
–
x
Thallium, soluble compounds (as Tl)
7440-28-0
–
0.1
–
–
–
–
x
4,4'-Thiobis(6-tert-butyl-m- cresol)
Respirable dust Total dust
96-69-5
–
–
5
10
–
–
–
–
–
–
–
–
–
–
Thioglycolic acid
68-11-1
1
4
–
–
–
–
x
Thionyl chloride
7719-09-7
–
–
–
–
1
5
–
Thiram
137-26-8
–
5
–
–
–
–
–
Tin, Inorganic compounds (except oxides)
(as Sn)
Organic compounds (as Sn) Oxides (as Sn)
7440-31-5
7440-31-5
21651-19-
4
–
–
–
2
0.1
2
–
–
–
–
–
–
–
–
–
–
–
–
–
x
–
Titanium dioxide Total dust
13463-67-
7
–
10
–
–
–
–
–
Toluene
108-88-3
100
375
150
560
–
–
–
Toluene-2,4-diisocyanate (TDI)
584-84-9
0.005
0.04
0.02
0.15
–
–
–
m-Toluidine
108-44-1
2
9
–
–
–
–
x
o-Toluidine
95-53-4
5
22
–
–
–
–
x
p-Toluidine
106-49-0
2
9
–
–
–
–
x
Toxaphene; see Chlorinated camphene
Tremolite; see Silicates
Tributyl phosphate
126-73-8
0.2
2.5
–
–
–
–
–
Trichloroacetic acid
76-03-9
1
7
–
–
–
–
–
1,2,4-Trichlorobenzene
120-82-1
–
–
–
–
5
40
–
1,1,1-Trichloroethane; see Methyl
chloroform
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
1,1,2-Trichloroethane
79-00-5
10
45
–
–
–
–
x
Trichloroethylene
79-01-6
50
270
200
1080
–
–
–
Trichloromethane; see Chloroform
Trichloronaphthalene
1321-65-9
–
5
–
–
–
–
x
1,2,3-Trichloropropane
96-18-4
10
60
–
–
–
–
–
1,1,2-Trichloro-1,2,2- trifluoroethane
76-13-1
1000
7600
1250
9500
–
–
–
Triethylamine
121-44-8
10
40
15
60
–
–
–
Trifluorobromomethane
75-63-8
1000
6100
–
–
–
–
–
Trimellitic anhydride
552-30-7
0.005
0.04
–
–
–
–
–
Trimethylamine
75-50-3
10
24
15
36
–
–
–
Trimethyl benzene
25551-13-
7
25
125
–
–
–
–
–
Trimethyl phosphite
121-45-9
2
10
–
–
–
–
–
2,4,6-Trinitrophenol; see Picric acid
2,4,6-
Trinitrophenylmethylnitramine; see Tetryl
2,4,6-Trinitrotoluene (TNT)
118-96-7
–
0.5
–
–
–
–
x
Triorthocresyl phosphate
78-30-8
–
0.1
–
–
–
–
x
Triphenyl amine
603-34-9
–
5
–
–
–
–
–
Triphenyl phosphate
115-86-6
–
3
–
–
–
–
–
Tungsten
7440-33-7
–
–
5
1
–
–
10
3
–
–
–
–
Insoluble compounds (as W) Soluble compounds (as W)
Turpentine
8006-64-2
100
560
–
–
–
–
–
Uranium (as U)
7440-61-1
–
0.2
–
0.6
–
–
–
Insoluble compounds
Soluble compounds
–
0.05
–
-
–
–
–
n-Valeraldehyde
110-62-3
50
175
–
–
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Vanadium pentoxide
1314-62-1
–
0.05
–
–
–
–
–
Fume (as V2O5)
Respirable dust (as V2O5)
–
0.05
–
–
–
–
–
Vegetable oil mists
–
–
5
–
–
–
–
–
Respirable mist
Total mist
–
15
–
–
–
–
–
Vinyl acetate
108-05-4
10
30
20
60
–
–
–
Vinyl benzene; see Styrene
Vinyl bromide
593-60-2
5
20
–
–
–
–
–
Vinyl chloride; see OH Part 302, R 325.51401 to
R 325.51414F
et seq.F75-01-4
1
2.5
5
12.8
Vinyl cyanide; see Acrylonitrile
Vinyl cyclohexene dioxide
106-87-6
10
60
–
–
–
–
x
Vinylidene chloride (1,1- Dichloroethylene)
75-35-4
1
4
–
–
–
–
–
Vinyl toluene
25013-15-
4
100
480
–
–
–
–
–
VM & P Naphtha
8032-32-4
300
1350
400
1800
–
–
–
Warfarin
81-81-2
–
0.1
–
–
–
–
–
Welding fumes (Total particulate)*
–
–
5
–
–
–
–
–
Wood dust, all soft and hard woods
(except Western red cedar)
–
–
5
–
10
–
–
–
Wood dust, Western red cedar
–
–
2.5
–
–
–
–
–
Xylene (o-,m-,p-isomers) (Dimethyl benzene)
1330-20-7
100
435
150
655
–
–
–
m-Xylene-alpha, alpha’- diamine
1477-55-0
–
–
–
–
–
0.1
x
Xylidine
1300-73-8
2
10
–
–
–
–
x
Yttrium
7440-65-5
–
1
–
–
–
–
–
Zinc chloride fume
7646-85-7
–
1
–
2
–
–
–
TABLE G-1-A. EXPOSURE LIMITS FOR AIR CONTAMINANTS
TWA
STELD
Ceiling
Substance
CAS No.A
ppmB
mg/m3C
ppmB
mg/m3C
ppmB
mg/m3C
Skin Designatio n
Zinc chromates
(as CrO3)(as Cr+6); see OH Part 315,R 325.50141 to R 325.50143F,
G
Varies with compound
–
0.005
(5
μg/m3)
–
–
–
0.1
–
Zinc oxide fume
1314-13-2
–
5
–
10
–
–
–
Zinc oxide,
1314-13-2
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Zinc stearate
557-05-1
–
5
–
–
–
–
–
Respirable dust
Total dust
–
10
–
–
–
–
–
Zirconium compounds (as Zr)
7440-67-7
–
5
–
10
–
–
–
Document Information
- Rules:
- R325.35001
R325.35011
R325.50051
R325.50076
R325.50091
R325.50092
R325.50101
R325.50136
R325.50141
R325.50143
R325.51101
R325.51103
R325.51104
R325.51105
R325.51108
R325.51151
R325.51177
R325.51311
R325.51312
R325.51401
R325.51414
R325.51451
R325.51477
R325.51501
R325.51527
R325.51601
R325.51628
R325.51651
R325.51652
R325.51851
R325.51886
R325.51901
R325.51958
R325.60051
R325.60052
R325.60151
R325.60161
R325.77101
R325.77115